First of all, do you have a 3 terminal (BAT GEN FLD) or a 4 terminal (BAT LOAD FLD GEN) Voltage Regulator??????
On most 4 terminal VR's the GEN/ARM is off on one side or underneath all by itself. The three terminals side by side are BAT LOAD and FLD. SO INSURE WHICH YOU HAVE AND THATS ITS WIRED CORRECTLY
BAT to load side of ammeter GEN/ARM to Gennys ARM post FLD to gennys FLD post LOAD sends hot battery voltage up to switch
Has polarity been changed on the tractor?? if the ammeter is wired correct when you turn on lights or ignition engine NOT running it should swing over towards - discharge, then when started at fast RPM it should swing to + charge IF GENNY WORKS AND METER IS WIRED CORRECT. If it does the opposite its wires need swapped.
If the batetry voltage is around 12.6 when shes setting but at fast running RPM it rises to 13 to 14 or so THE GENNY IS WORKING even if the ammeter isnt or is wired bass ackwards reading the opposite
If she charges fine when you dead ground the gennys FLD post but NOT otherwise, that tells you the Genny itself is okay so the problem is EITHER The VR is bad,,,,,,,,Or the VR isnt well grounded (try that first),,,,,,,,Or the wires bad or open or mis wired from FLD on Genny to FLD on the VR
If when you turn the tractor off theres a high current discharge, the VR's Cutout Relay is sticking closed
Run my Troubleshooting procedure, it will tell if the Genny or VR is bad
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